UPD784907 Datasheet, PDF (64/98 Pages) NEC – 16-BIT SINGLE-CHIP MICROCONTROLLER

µPD784907, 784908
13. REGULATOR
The µPD784908 incorporates a regulator (a circuit which enables low-voltage operation) to reduce the current
consumption of the device. To enable or disable the operation of this regulator, specify the input level of the REGOFF
pin. To disable the operation of the regulator, input a high level signal to the REGOFF pin. To enable operation, input
a low level signal to the REGOFF pin.
When the regulator is turned on, the CPU enters low-power mode. It is recommended to operate this product using
this regulator.
To stabilize the regulator output voltage, connect a capacitor (of about 1µF) to the REGC pin (stabilizing capacitor
connection pin).
When the regulator is stopped, apply the same level as VDD to the REGC pin. Figure 13-1 is a block diagram of
the regulator's peripheral circuits.
Figure 13-1. Regulator Peripheral Circuits
REGOFF
Low level: Regulator is turned on.
High level: Regulator is turned off.
VDD
REGC
1 µF
Regulator
Stops oscillation.
STBC.7
Internal power supply voltage
(Supplies to the CPU and
peripheral circuits.)
• Processing for the REGC pin
When the regulator is operating
When the regulator is stopped
Connect a capacitor to stabilize the regulator.
Supply the power supply voltage.
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Data Sheet U11680EJ2V0DS00